#front-base {
    background-image: url('/images/dentist_bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 100vh;
}
.btn-primary {
    background-color: #000 !important;
    border-color: #000 !important;
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
    background-color: #222 !important;
    border-color: #222 !important;
}